WO2017182018A1 - Culbuteur pour un moteur à combustion interne - Google Patents

Culbuteur pour un moteur à combustion interne Download PDF

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Publication number
WO2017182018A1
WO2017182018A1 PCT/DE2017/100191 DE2017100191W WO2017182018A1 WO 2017182018 A1 WO2017182018 A1 WO 2017182018A1 DE 2017100191 W DE2017100191 W DE 2017100191W WO 2017182018 A1 WO2017182018 A1 WO 2017182018A1
Authority
WO
WIPO (PCT)
Prior art keywords
cam roller
thrust washer
drag lever
lever according
coating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/DE2017/100191
Other languages
German (de)
English (en)
Inventor
Rainer Bleyh
Stefan Dupke
Max Schäfer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Publication of WO2017182018A1 publication Critical patent/WO2017182018A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2305/00—Valve arrangements comprising rollers

Definitions

  • the invention relates to a drag lever for actuating a gas exchange valve of an internal combustion engine.
  • Drag levers are used in internal combustion engines with overhead camshaft within the valve train to initiate in each case between a cam of a camshaft and a respective gas exchange valve lying transfer element according to a contour of the cam a translatory movement in the gas exchange valve.
  • a drag lever usually has a one-armed lever body, which is supported at one end to a, connected to a cylinder head of the engine support member and communicates with its other end via a valve actuating surface with a valve stem of the gas exchange valve to be actuated.
  • a cam roller is arranged, against which in each case the cam of the camshaft starts and, in accordance with its contour, effects a pivoting movement of the cam follower.
  • US Pat. No. 4,727,832 discloses a drag lever with a cam roller.
  • the drag lever comprises two thrust washers, which are arranged on both sides between the cam roller and a respective side wall of the finger lever. Furthermore, the two thrust washers are formed of a wear-resistant material, in particular a phosphor bronze.
  • the object of the present invention is to further develop a drag lever, in particular, the friction between a cam roller and a lever body to be further reduced.
  • An inventive drag lever for actuating a gas exchange valve of an internal combustion engine comprises a lever body which is formed by two spaced parallel side walls and connecting the side walls, transverse web, wherein the web in the region of a first end serving for pivotally mounting the lever body socket and defined in the region of a second end provided for contact with the gas exchange valve valve actuation surface, wherein the side walls between them in bores receive a pivot pin, which rotates a cam roller via a needle ring, further arranged at least one side between the cam roller and the respective side wall thrust washer is, wherein the at least one thrust washer has at least partially a friction-reducing and wear-resistant coating.
  • the cam roller is rotatably received on the lever body, wherein the respective side wall has a respective bore for receiving the axle bolt.
  • the cam roller is intended to come to rest on a cam of a camshaft.
  • the inner faces of the side walls form the lateral start-up for the interposed cam roller.
  • the at least one thrust washer has a rubbing-reducing and wear-resistant coating.
  • the coating can be formed chemically or galvanically on the at least one thrust washer.
  • the invention includes the technical teaching that the cam roller has an oblique position between the two side walls.
  • the axle pin is not arranged perpendicular to the two parallel side walls, but with a slight inclination, wherein the cam roller starts only on one side wall. Due to the specific inclination of the cam roller in the lever body, the position of the finger lever on the gas exchange valve can be determined. Due to the inclination of the cam roller, a respective axial gap between the cam roller and the lever body is non-uniform.
  • the cam roller is not arranged parallel to the two side walls.
  • a single thrust washer which has only partially a friction-reducing and wear-resistant coating, between the cam roller and the side wall, which serves the cam roller for starting, arranged.
  • the at least one thrust washer is arranged on the front side of the cam roller.
  • a respective coated thrust washer is attached on both sides between the cam roller and the respective side wall. assigns.
  • two thrust washers are arranged on the cam roller, wherein each of the two thrust washers is intended to run against the respective side wall.
  • the coating is formed at least on an end face of the at least one stop disk adjacent to the cam roller. If the coating is not formed completely or at least on the two end faces of the thrust washer, the coating is formed at least on the end face of the thrust washer adjacent to the cam roller.
  • the rolling elements of the needle ring also run axially against the at least one thrust washer. Due to the coating, the friction and wear are reduced here as well.
  • the at least one thrust washer is formed of a steel material.
  • the coating is formed on the at least one thrust washer of amorphous carbon.
  • Amorphous carbon is also known by the name DLC (diamond like carbon) or diamond-like carbon.
  • the at least one thrust washer is annular, wherein an outer diameter of the at least one thrust washer is smaller than an outer OH prepare for the friction torque. Due to the smaller outer diameter of the thrust washer relative to the outer diameter of the cam roller and the concomitant lower lever arm for the friction torque, the friction torque between the thrust washer and the lever body decreases. Further measures improving the invention will be described in more detail below together with the description of two preferred embodiments of the invention with reference to the three figures, in which the same or similar elements are provided with the same reference numerals.
  • FIG. 1 shows a simplified schematic side view to illustrate the structure of a finger lever according to the invention with a cam roller according to a first embodiment, a simplified schematic perspective view illustrating the structure of the cam roller according to Figure 1, and a simplified schematic plan view to illustrate the structure of a finger lever according to the invention with a cam roller according to a second embodiment.
  • a drag lever 1 for actuating a gas exchange valve (not shown here) of an internal combustion engine has a lever body 2 which extends through two spaced parallel side walls 4, 5 and one of the two side walls 4, 5 connecting, transverse web 6 is formed.
  • the web 6 comprises in the region of a first end serving for the pivotable mounting of the lever body 2 socket 8 and in the region of a second end provided for contact with the gas exchange valve actuator surface 7.
  • the two side walls 4, 5 take in between holes in a pivot pin 9 , which leads a cam roller 3 via a - shown in Figure 2 - needle ring 10 rotatable. According to Figure 1, the cam roller 3 comes to a cam 1 1 a - not shown - camshaft to the plant.
  • the cam roller 3 shown in Figure 1 is completely shown in Figure 2 and is thus not covered as shown in Figure 1 of the side wall 5 of the finger lever 1.
  • the cam roller 3 has, in addition to the needle ring 10, a first and a second stop disk 12a, 12b, which are each arranged on the front side of the cam roller 3. Consequently, according to FIG. 1, a respective thrust washer 12a, 12b is arranged on both sides between the cam roller 3 and the respective side wall 4, 5.
  • Both thrust washers 12a, 12b have a friction-reducing and wear-resistant coating 13 covering the entire surface.
  • the respective thrust washer 12a, 12b is made of a steel material, wherein the coating 13 is formed of amorphous carbon. Thus, it is a DLC
  • respective thrust washer 12a, 12b is annular, wherein an outer diameter of the respective thrust washer 12a, 12b is smaller than an outer diameter of the cam roller 3.
  • a plurality of beads 14 are formed to the oil passage.
  • FIG. 3 shows a second embodiment of the drag lever 1 according to the invention.
  • the cam roller 3 has an oblique position between the two side walls 4, 5 and furthermore has only one thrust washer 12a, wherein the thrust washer 12a only partially has a friction-reducing and wear-resistant coating 13.
  • the targeted inclination of the cam roller 3 (arrow pointing to the right on the cam roller 3) by the targeted inclination of the axle pin 9 leads to a rotation of the finger lever 1 (right arrow at the end of the finger lever 1).
  • the cam roller 3 thus runs only on the side wall 4.
  • the coating 13 is formed exclusively on an adjacent to the cam roller 3 end face of the thrust washer 12a.
  • the thrust washer 12a according to FIG.
  • Figure 3 illustrates, with respect to the friction between the cam roller 3 and the lever body 2 is a particularly advantageous embodiment of the finger lever 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

L'invention concerne un culbuteur (1) pour l'actionnement d'une soupape d'échange de gaz d'un moteur à combustion interne, comprenant un corps de culbuteur (2) qui est formé par deux parois latérales (4, 5) parallèles s'étendant à distance l'une de l'autre et un élément jointif (6) s'étendant transversalement et reliant les parois latérales (4, 5) l'une à l'autre. L'élément jointif (6) forme, dans la région d'une première extrémité, un coussinet sphérique (8) servant à supporter le corps de culbuteur (2) de manière pivotante et définit, dans la région d'une deuxième extrémité, une surface d'actionnement de soupape (7) destinée à venir en contact avec la soupape d'échange de gaz. Les parois latérales (4, 5) reçoivent entre elles, dans des alésages, un boulon d'axe (9), lequel guide de manière rotative un galet de came (3) par le biais d'une couronne d'aiguilles (10) d'un palier à aiguilles. En outre, un disque de butée (12a) est disposé au moins d'un côté entre le galet de came (3) et la paroi latérale (4, 5) respective. Ledit au moins un disque de butée (12a) comprend au moins partiellement un revêtement (13) réduisant la friction et résistant à l'usure.
PCT/DE2017/100191 2016-04-22 2017-03-10 Culbuteur pour un moteur à combustion interne Ceased WO2017182018A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016206837.7A DE102016206837A1 (de) 2016-04-22 2016-04-22 Schlepphebel für eine Brennkraftmaschine
DE102016206837.7 2016-04-22

Publications (1)

Publication Number Publication Date
WO2017182018A1 true WO2017182018A1 (fr) 2017-10-26

Family

ID=58503551

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2017/100191 Ceased WO2017182018A1 (fr) 2016-04-22 2017-03-10 Culbuteur pour un moteur à combustion interne

Country Status (2)

Country Link
DE (1) DE102016206837A1 (fr)
WO (1) WO2017182018A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018104569A1 (de) * 2018-02-28 2019-08-29 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Nachstellvorrichtung für eine Scheibenbremse

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4727832A (en) 1986-06-13 1988-03-01 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Roller rocker arm
US6199527B1 (en) * 1998-03-12 2001-03-13 Nsk Ltd. Sheet metal rocker arm, manufacturing method thereof, cam follower with said rocker arm, and assembling method thereof
US20120031223A1 (en) * 2010-08-03 2012-02-09 Schaeffler Technologies Gmbh & Co. Kg Cam follower
JP2013029027A (ja) * 2011-07-26 2013-02-07 Nsk Ltd カムフォロア装置
US20150176691A1 (en) * 2013-12-23 2015-06-25 Aktiebolaget Skf Cam follower roller device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19639148A1 (de) * 1996-09-24 1997-10-23 Daimler Benz Ag Ventilbetätigungshebel für Brennkraftmaschinen
US5960758A (en) * 1998-05-05 1999-10-05 General Motors Corporation Roller cam follower bearing shaft retention
DE10054506A1 (de) * 2000-11-03 2002-05-16 Ina Schaeffler Kg Vorrichtung zur Steuerung des Gaswechsels von Viertakt-Ottomotoren mit variabel steuerbaren Einlaßventilen
CN103477036A (zh) * 2011-10-04 2013-12-25 日锻汽门株式会社 动阀装置的摇臂
DE102011120011A1 (de) * 2011-12-02 2012-06-14 Daimler Ag Ventiltriebvorrichtung
DE102013205533A1 (de) * 2013-03-28 2014-10-02 Schaeffler Technologies Gmbh & Co. Kg Verfahren zur Montage eines Ventiltrieb einer Brennkraftmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4727832A (en) 1986-06-13 1988-03-01 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Roller rocker arm
US6199527B1 (en) * 1998-03-12 2001-03-13 Nsk Ltd. Sheet metal rocker arm, manufacturing method thereof, cam follower with said rocker arm, and assembling method thereof
US20120031223A1 (en) * 2010-08-03 2012-02-09 Schaeffler Technologies Gmbh & Co. Kg Cam follower
JP2013029027A (ja) * 2011-07-26 2013-02-07 Nsk Ltd カムフォロア装置
US20150176691A1 (en) * 2013-12-23 2015-06-25 Aktiebolaget Skf Cam follower roller device

Also Published As

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